Rendering of perspective linearized depth map kind of works now

data/shaders/fs_depthbuffer.glsl

@@ -4,13 +4,19 @@ in vec2 ioUV;
 
 out vec3 outColor;
 
-uniform sampler2D uTexture;
+uniform sampler2D uDepthTexture;
+uniform float uIsOrthographic;
 uniform float uNear;
 uniform float uFar;
 
 void main() {
-	float z = texture(uTexture, ioUV).r;
+	float z = texture(uDepthTexture, ioUV).r;
-	float c = (z - uNear) / (uFar - uNear);
+	float c;
+	if (uIsOrthographic == 1.0) {
+		c = (z - uNear) / (uFar - uNear);
+	} else {
+		c = (2.0 * uNear) / (uFar + uNear - z * (uFar - uNear));
+	}
 
 	outColor = vec3(c);
 }

data/shaders/fs_shadowmap.frag

@@ -0,0 +1,32 @@
+#version 150 core
+
+uniform vec4 uColor;
+uniform vec3 uLightDirection;
+uniform vec3 uViewPosition;
+
+smooth in vec4 ioFragColor;
+in vec3 ioNormal;
+in vec3 ioFragPosition;
+
+out vec4 outColor;
+
+void main() {
+	// ambient lighting
+	float ambient_strength = 0.1;
+	vec4 ambient = ambient_strength * ioFragColor;
+
+	// diffuse lighting
+	vec3 normal_dir = normalize(ioNormal);
+	vec3 light_dir = normalize(uLightDirection);
+	float diff = max(dot(normal_dir, light_dir), 0.0);
+	vec4 diffuse = diff * ioFragColor;
+
+	// specular lighting
+	vec3 view_dir = normalize(uViewPosition - ioFragPosition);
+	vec3 halfway_dir = normalize(light_dir + view_dir);
+
+	float spec = pow(max(dot(normal_dir, halfway_dir), 0.0), 32);
+	vec4 specular = spec * vec4(0.5);
+
+	outColor = ambient + diffuse + specular;
+}

data/shaders/vs_shadowmap.vert

@@ -0,0 +1,25 @@
+#version 150 core
+#extension GL_ARB_explicit_attrib_location : require
+
+in vec4 inCoord;
+in vec3 inNormal;
+in vec2 inUV;
+in vec4 inColor;
+
+uniform mat4 uModelMatrix;
+uniform mat4 uViewMatrix;
+uniform mat4 uProjectionMatrix;
+uniform mat3 uNormalMatrix;
+uniform vec3 uLightDirection;
+uniform vec3 uViewPosition;
+
+smooth out vec4 ioFragColor;
+out vec3 ioNormal;
+out vec3 ioFragPosition;
+
+void main() {
+	gl_Position = uProjectionMatrix * uViewMatrix * uModelMatrix * inCoord;
+	ioFragColor = inColor;
+	ioNormal = uNormalMatrix * inNormal;
+	ioFragPosition = (uModelMatrix * inCoord).xyz;
+}

src/modules/RenderModule.cc

@@ -154,37 +154,31 @@ const struct module_api MODULE_API = {
 
 
 
-//
+void Light::Initialize() {
-// Camera
+  gLog("Initializing light");
-//
+	mShadowMapProgram = RenderProgram("data/shaders/vs_shadowmap.vert", "data/shaders/fs_shadowmap.frag");
-void Camera::UpdateMatrices() {
-	mViewMatrix = LookAt(mEye, mPoi, mUp);
 
-	if (mIsOrthographic) {
+	bool load_result = mShadowMapProgram.Load();
-		mProjectionMatrix = Ortho(-1.0f, 1.0f, -1.0f, 1.0f, mNear, mFar);
+	mShadowMapProgram.RegisterFileModification();
-	} else {
+	assert(load_result);
-		mProjectionMatrix = Perspective(mFov, mWidth / mHeight, mNear, mFar);
+
-	}
+	gLog("Initializing light render target size: %d, %d", mShadowMapSize, mShadowMapSize);
+	mShadowMapTarget.Initialize(mShadowMapSize, mShadowMapSize,
+			RenderTarget::EnableColor
+			| RenderTarget::EnableDepthTexture
+			| RenderTarget::EnableLinearizedDepthTexture);
+
+	glBindFramebuffer(GL_FRAMEBUFFER, mShadowMapTarget.mFrameBufferId);
+	gLog("Framebuffer of light has id: %d", mShadowMapTarget.mFrameBufferId);
+	gLog("Initializing light done");
 }
 
-void Camera::DrawGui() {
+void Light::UpdateMatrices() {
-	ImGui::Text("Width %3.4f, Height %3.4f", mWidth, mHeight);
+	mLightProjection = Ortho (-mBBoxSize * 0.5f, mBBoxSize * 0.5f, -mBBoxSize * 0.5f, mBBoxSize * 0.5f, mNear, mFar);
-
+	mLightView = LookAt(mDirection * mBBoxSize * 0.5f, Vector3f (0.0f, 0.0f, 0.0f), Vector3f (0.0f, 1.0f, 0.0f));
-	ImGui::InputFloat3("Eye", mEye.data(), -10.0f, 10.0f);
+	mLightSpaceMatrix = mLightProjection * mLightView;
-	ImGui::SliderFloat3("EyeS", mEye.data(), -10.0f, 10.0f);
-
-	ImGui::InputFloat3("Poi", mPoi.data(), -10.0f, 10.0f);
-	ImGui::InputFloat3("Up", mUp.data(), -10.0f, 10.0f);
-	ImGui::Checkbox("Orthographic", &mIsOrthographic);
-	ImGui::SliderFloat("Fov", &mFov, 5, 160);
-	ImGui::SliderFloat("Near", &mNear, -10, 10);
-	ImGui::SliderFloat("Far", &mFar, -20, 50);
-	if (ImGui::Button("Reset")) {
-		*this = Camera();
-	}
 }
 
-
 //
 // Renderer
 //
@@ -300,20 +294,6 @@ void Renderer::Initialize(int width, int height) {
 	mDefaultProgram.RegisterFileModification();
 	assert(load_result);
 
-	// Render Target
-	mRenderTarget = RenderTarget (width, height, 
-			RenderTarget::EnableColor 
-			| RenderTarget::EnableDepthTexture 
-			| RenderTarget::EnableLinearizedDepthTexture);
-
-	// Render Target Quad
-	glGenVertexArrays(1, &mRenderQuadVertexArrayId);
-	glBindVertexArray(mRenderQuadVertexArrayId);
-	
-	glGenBuffers(1, &mRenderQuadVertexBufferId);
-	glBindBuffer(GL_ARRAY_BUFFER, mRenderQuadVertexBufferId);
-	glBufferData(GL_ARRAY_BUFFER, sizeof(g_quad_vertex_buffer_data), g_quad_vertex_buffer_data, GL_STATIC_DRAW);
-
 	// Program for color texture rendering
 	mRenderQuadProgramColor = RenderProgram("data/shaders/vs_passthrough.glsl", "data/shaders/fs_simpletexture.glsl");
 	load_result = mRenderQuadProgramColor.Load();
@@ -333,6 +313,27 @@ void Renderer::Initialize(int width, int height) {
 	muRenderQuadDepthNear = mRenderQuadProgramDepth.GetUniformLocation("uNear");	
 	muRenderQuadDepthFar = mRenderQuadProgramDepth.GetUniformLocation("uFar");	
 
+	// Render Target
+	gLog("Initializing main render target size: %d,%d", width, height);
+	mRenderTarget.Initialize(width, height, 
+			RenderTarget::EnableColor 
+			| RenderTarget::EnableDepthTexture 
+			| RenderTarget::EnableLinearizedDepthTexture);
+
+	// Render Target Quad
+	glGenVertexArrays(1, &mRenderQuadVertexArrayId);
+	glBindVertexArray(mRenderQuadVertexArrayId);
+	
+	glGenBuffers(1, &mRenderQuadVertexBufferId);
+	glBindBuffer(GL_ARRAY_BUFFER, mRenderQuadVertexBufferId);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(g_quad_vertex_buffer_data), g_quad_vertex_buffer_data, GL_STATIC_DRAW);
+
+	mRenderTarget.mQuadVertexArray = mRenderQuadVertexArrayId;
+	mRenderTarget.mQuadVertexBuffer = mRenderQuadVertexBufferId;
+	mRenderTarget.mLinearizeDepthProgram = mRenderQuadProgramDepth;
+
+	// Light
+	mLight.Initialize();
 }
 
 void Renderer::Shutdown() {
@@ -348,14 +349,25 @@ void Renderer::RenderGl() {
 		mCamera.mHeight = mSceneAreaHeight;
 	}
 
-	glViewport(0, 0, mCamera.mWidth, mCamera.mHeight);
+	// Shadow Map
-	mCamera.UpdateMatrices();
+	glViewport(0, 0, mLight.mShadowMapSize, mLight.mShadowMapSize);
+	mLight.mShadowMapTarget.Bind();
+		glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
+		glUseProgram(mLight.mShadowMapProgram.mProgramId);
+		RenderScene(mLight.mShadowMapProgram);
+	glBindFramebuffer(GL_FRAMEBUFFER, 0);
+	// TODO: render linearized depth for the light
+	// mLight.mShadowMapTarget.RenderToLinearizedDepth(mCamera);
 
+	// Regular rendering
 	glEnable(GL_LINE_SMOOTH);
 	glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
 	glEnable(GL_MULTISAMPLE);
 	glEnable(GL_CULL_FACE);
 
+	glViewport(0, 0, mCamera.mWidth, mCamera.mHeight);
+	mCamera.UpdateMatrices();
+
 	Matrix44f model_matrix = TranslateMat44(0.0f, 0.0f, 0.0f);
 	Matrix44f model_view_projection = 
 		model_matrix
@@ -373,7 +385,7 @@ void Renderer::RenderGl() {
 
 	// clear color and depth
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-	glEnable(GL_DEPTH_TEST);
+	glDisable(GL_DEPTH_TEST);
 
 	glUseProgram(mSimpleProgram.mProgramId);
 	mSimpleProgram.SetMat44("uModelViewProj", model_view_projection);
@@ -399,65 +411,38 @@ void Renderer::RenderGl() {
 	gVertexArray.Bind();
 	gXZPlaneMesh.Draw(GL_LINES);
 
-	// Unit cube
+	// Scene
 	glUseProgram(mDefaultProgram.mProgramId);
-	gVertexArray.Bind();
+	glBindTexture(GL_TEXTURE_2D, mLight.mShadowMapTarget.mDepthTexture);
+	glEnable(GL_DEPTH_TEST);
 
-	model_matrix = TranslateMat44(3.0f, 0.0f, 1.0f);
+	RenderScene(mDefaultProgram);
-	Matrix33f normal_matrix = model_matrix.block<3,3>(0,0).transpose();
-	normal_matrix = normal_matrix.inverse();
-
-	mDefaultProgram.SetMat44("uModelMatrix", model_matrix);
-	mDefaultProgram.SetMat44("uViewMatrix", mCamera.mViewMatrix);
-	mDefaultProgram.SetMat44("uProjectionMatrix", mCamera.mProjectionMatrix);
-	mDefaultProgram.SetMat33("uNormalMatrix", normal_matrix);
-
-  mDefaultProgram.SetVec4("uColor", Vector4f (1.0f, 0.0f, 0.0f, 1.0f));
-	mDefaultProgram.SetVec3("uLightDirection", mLight.mDirection);
-	mDefaultProgram.SetVec3("uViewPosition", mCamera.mEye);
-	gVertexArray.Bind();
-	gUnitCubeMesh.Draw(GL_TRIANGLES);
 
 	if (mSettings->DrawDepth) {
-		mRenderTarget.RenderToLinearizedDepth(true);
+		mRenderTarget.RenderToLinearizedDepth(mCamera);
-		glClear(GL_COLOR_BUFFER_BIT);
-		glDisable(GL_DEPTH_TEST);
-
-		Matrix44f model_view_projection = Matrix44f::Identity();
-
-		// render depth texture
-		glUseProgram(mRenderQuadProgramDepth.mProgramId);
-		glUniformMatrix4fv(muRenderQuadModelViewProj, 1, GL_FALSE, model_view_projection.data());
-
-		glActiveTexture(GL_TEXTURE0);
-		glBindTexture(GL_TEXTURE_2D, mRenderTarget.mDepthTexture);
-		glUniform1i(muRenderQuadTexture, 0);
-
-		// TODO: adjust for perspective
-		glUniform1f(muRenderQuadDepthNear, mCamera.mNear);
-		// TODO: why do I have to divide by depth range?
-		glUniform1f(muRenderQuadDepthFar, mCamera.mFar / (mCamera.mFar - mCamera.mNear));
-
-		glEnableVertexAttribArray(0);
-		glBindBuffer(GL_ARRAY_BUFFER, mRenderQuadVertexBufferId);
-		glVertexAttribPointer(
-				0,				// attribute 0
-				3,				// size
-				GL_FLOAT,	// type
-				GL_FALSE,	// normalized?
-				0,				// stride
-				(void*)0	// offset
-				);
-
-		glDrawArrays(GL_TRIANGLES, 0, 6);	// starting from vertex 0; 3 vertices total
-
-		mRenderTarget.RenderToLinearizedDepth(false);
 	}
 
 	glDisableVertexAttribArray(0);
 	glBindFramebuffer(GL_FRAMEBUFFER, 0);
 }
 
+void Renderer::RenderScene(RenderProgram &program) {
+	Matrix44f model_matrix = TranslateMat44(3.0f, 0.0f, 1.0f);
+	Matrix33f normal_matrix = model_matrix.block<3,3>(0,0).transpose();
+	normal_matrix = normal_matrix.inverse();
+
+	program.SetMat44("uModelMatrix", model_matrix);
+	program.SetMat44("uViewMatrix", mCamera.mViewMatrix);
+	program.SetMat44("uProjectionMatrix", mCamera.mProjectionMatrix);
+	program.SetMat33("uNormalMatrix", normal_matrix);
+
+  program.SetVec4("uColor", Vector4f (1.0f, 0.0f, 0.0f, 1.0f));
+	program.SetVec3("uLightDirection", mLight.mDirection);
+	program.SetVec3("uViewPosition", mCamera.mEye);
+	gVertexArray.Bind();
+	gUnitCubeMesh.Draw(GL_TRIANGLES);
+}
+
 void Renderer::RenderGui() {
 	if (ImGui::BeginDock("Scene")) {
 		ImGui::Checkbox("Draw Depth", &mSettings->DrawDepth);
@@ -486,11 +471,17 @@ void Renderer::RenderGui() {
 	if (ImGui::BeginDock("Render Settings")) {
 		ImGui::Text("Light");
 		ImGui::SliderFloat3("Direction", mLight.mDirection.data(), -10.0f, 10.0f);
+		ImVec2 content_avail = ImGui::GetContentRegionAvail();
+		ImGui::Image((void*) mLight.mShadowMapTarget.mLinearizedDepthTexture,
+				ImVec2(content_avail.x, content_avail.x),
+				ImVec2(0.0f, 1.0f),
+				ImVec2(1.0f, 0.0f)
+				);
 		ImGui::Text("Camera");
 		mCamera.DrawGui();
 
 		ImGui::Text("Default Texture");
-		const ImVec2 content_avail = ImGui::GetContentRegionAvail();
+		content_avail = ImGui::GetContentRegionAvail();
 		ImGui::Image((void*) mDefaultTexture.mTextureId, 
 				ImVec2(content_avail.x, content_avail.x),
 				ImVec2(0.0f, 1.0f), 

src/modules/RenderModule.h

@@ -14,94 +14,40 @@
 #include "Globals.h"
 #include "RenderUtils.h"
 
-struct Camera {
-	Vector3f mEye;
-	Vector3f mPoi;
-	Vector3f mUp;
-
-	float mNear;
-	float mFar;
-	float mFov;
-	bool mIsOrthographic;
-	float mWidth;
-	float mHeight;
-
-	Matrix44f mProjectionMatrix;
-	Matrix44f mViewMatrix;
-
-	Camera() :
-		mEye {5.f, 4.f, 5.f},
-		mPoi {0.f, 2.f, 0.f},
-		mUp  {0.f, 1.f, 0.f},
-		mNear (0.1f),
-		mFar (150.f),
-		mFov (60.f),
-		mIsOrthographic (false),
-		mWidth (-1.f),
-		mHeight (-1.f),
-
-		mProjectionMatrix (
-			1.f, 0.f, 0.f, 0.f,
-			0.f, 1.f, 0.f, 0.f,
-			0.f, 0.f, 1.f, 0.f,
-			0.f, 0.f, 0.f, 1.f),
-		mViewMatrix (
-			1.f, 0.f, 0.f, 0.f,
-			0.f, 1.f, 0.f, 0.f,
-			0.f, 0.f, 1.f, 0.f,
-			0.f, 0.f, 0.f, 1.f)
-		{}
-
-	void UpdateMatrices();
-	void DrawGui();
-};
-
 struct Light {
 	Vector3f mPosition;
 	Vector3f mDirection;
 
-	float mViewMatrix[16];
+	RenderTarget mShadowMapTarget;
-	float mProjectionMatrix[16];
+	RenderProgram mShadowMapProgram;
-	float mtxLight[16];
-	float mtxShadow[16];
 
-	float shadowMapBias;
+	float mShadowMapBias;
-	uint16_t shadowMapSize;
+	uint16_t mShadowMapSize;
 
-	bool enabled;
+	float mNear;
-	float near;
+	float mFar;
-	float far;
+	float mBBoxSize;
-	float area;
+
+	Matrix44f mLightProjection;
+	Matrix44f mLightView;
+	Matrix44f mLightSpaceMatrix;
 
 	Light() :
 		mPosition (Vector3f(0.f, 10.f, 10.f)),
 		mDirection (Vector3f(-1.f, -1.f, -1.f)),
-		mViewMatrix {
+		mShadowMapBias (0.004f),
-			1.f, 0.f, 0.f, 0.f,
+		mShadowMapSize (1024),
-			0.f, 1.f, 0.f, 0.f,
+		mNear (0.1f),
-			0.f, 0.f, 1.f, 0.f,
+		mFar (100.f),
-			0.f, 0.f, 0.f, 1.f
+		mBBoxSize (10.f),
-		},
+		mLightProjection(Matrix44f::Identity()),
-		mProjectionMatrix {
+		mLightView(Matrix44f::Identity()),
-			1.f, 0.f, 0.f, 0.f,
+		mLightSpaceMatrix(Matrix44f::Identity())
-			0.f, 1.f, 0.f, 0.f,
-			0.f, 0.f, 1.f, 0.f,
-			0.f, 0.f, 0.f, 1.f
-		},
-		mtxShadow {
-			1.f, 0.f, 0.f, 0.f,
-			0.f, 1.f, 0.f, 0.f,
-			0.f, 0.f, 1.f, 0.f,
-			0.f, 0.f, 0.f, 1.f
-		},
-		shadowMapBias (0.004f),
-		shadowMapSize (2048),
-		near (0.1f),
-		far (100.f),
-		area (10.f),
-		enabled (false)
 	{
 	}
+
+	void Initialize();
+	void UpdateMatrices();
 };
 
 struct RendererSettings;
@@ -151,5 +97,6 @@ struct Renderer {
 	void Initialize(int width, int height);
 	void Shutdown();
 	void RenderGl();
+	void RenderScene(RenderProgram &program);
 	void RenderGui();
 };

src/modules/RenderUtils.cc

@@ -9,11 +9,46 @@
 #include "Globals.h"
 #include "FileModificationObserver.h"
 
+#include "imgui/imgui.h"
+#include "imgui_dock.h"
+
 #define STB_IMAGE_IMPLEMENTATION
 
 #include "stb/stb_image.h"
 
 using namespace SimpleMath;
+using namespace SimpleMath::GL;
+
+//
+// Camera
+//
+void Camera::UpdateMatrices() {
+	mViewMatrix = LookAt(mEye, mPoi, mUp);
+
+	if (mIsOrthographic) {
+		mProjectionMatrix = Ortho(-1.0f, 1.0f, -1.0f, 1.0f, mNear, mFar);
+	} else {
+		mProjectionMatrix = Perspective(mFov, mWidth / mHeight, mNear, mFar);
+	}
+}
+
+void Camera::DrawGui() {
+	ImGui::Text("Width %3.4f, Height %3.4f", mWidth, mHeight);
+
+	ImGui::InputFloat3("Eye", mEye.data(), -10.0f, 10.0f);
+	ImGui::SliderFloat3("EyeS", mEye.data(), -10.0f, 10.0f);
+
+	ImGui::InputFloat3("Poi", mPoi.data(), -10.0f, 10.0f);
+	ImGui::InputFloat3("Up", mUp.data(), -10.0f, 10.0f);
+	ImGui::Checkbox("Orthographic", &mIsOrthographic);
+	ImGui::SliderFloat("Fov", &mFov, 5, 160);
+	ImGui::SliderFloat("Near", &mNear, -10, 10);
+	ImGui::SliderFloat("Far", &mFar, -20, 50);
+	if (ImGui::Button("Reset")) {
+		*this = Camera();
+	}
+}
+
 
 //
 // RenderProgram
@@ -230,15 +265,21 @@ bool RenderProgram::OnFileChanged(const std::string& filename) {
 //
 // RenderTarget
 //
-RenderTarget::RenderTarget(int width, int height, int flags) {
+RenderTarget::~RenderTarget() {
+	Cleanup();
+}
+
+void RenderTarget::Initialize(int width, int height, int flags) {
+	Cleanup();
+
 	mFlags = flags;
 
-	Cleanup();
 	Resize(width, height);
 }
 
-RenderTarget::~RenderTarget() {
+void RenderTarget::Bind() {
-	Cleanup();
+	assert(glIsFramebuffer(mFrameBufferId));
+	glBindFramebuffer(GL_FRAMEBUFFER, mFrameBufferId);
 }
 
 void RenderTarget::Cleanup() {
@@ -277,7 +318,7 @@ void RenderTarget::Resize(int width, int height) {
 
 	Cleanup();
 
-	gLog("Resizing RenderTarget");
+	gLog("Resizing RenderTarget to %d,%d", width, height);
 
 	mWidth = width;
 	mHeight = height;
@@ -294,7 +335,7 @@ void RenderTarget::Resize(int width, int height) {
 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 
-		glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, mColorTexture, 0);
+		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mColorTexture, 0);
 	}
 
 	if (mFlags & EnableDepthTexture) {
@@ -310,7 +351,7 @@ void RenderTarget::Resize(int width, int height) {
 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 
-		glFramebufferTexture(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, mDepthTexture, 0);
+		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, mDepthTexture, 0);
 
 		if (mFlags & EnableLinearizedDepthTexture) {
 			glGenTextures(1, &mLinearizedDepthTexture);
@@ -329,15 +370,64 @@ void RenderTarget::Resize(int width, int height) {
 		glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, mWidth, mHeight);
 		glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, mDepthBuffer);
 	}
+
+	GLenum result = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+	if (result != GL_FRAMEBUFFER_COMPLETE) {
+		switch (result) {
+			case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT: gLog("Error: GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT");
+																								 break;
+			case GL_FRAMEBUFFER_UNDEFINED: gLog("Error: GL_FRAMEBUFFER_UNDEFINED");
+																								 break;
+			case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: gLog("Error: GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT");
+																												 break;
+			default: gLog("Error when creating Framebuffer: %d", result);
+		}
+	}
+
+	assert(result == GL_FRAMEBUFFER_COMPLETE);
 }
 
-void RenderTarget::RenderToLinearizedDepth(bool render_to_depth) {
+void RenderTarget::RenderToLinearizedDepth(const Camera& camera) {
-	if (render_to_depth) {
 	assert(mFlags & EnableLinearizedDepthTexture);
-		glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, mLinearizedDepthTexture, 0);
+	assert(mLinearizedDepthTexture != -1);
-	} else {
+	assert(mQuadVertexArray != -1);
-		glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, mColorTexture, 0);
+	assert(mQuadVertexBuffer != -1);
-	}
+
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mLinearizedDepthTexture, 0);
+
+	glBindFramebuffer(GL_FRAMEBUFFER, mFrameBufferId);
+	glClear(GL_COLOR_BUFFER_BIT);
+	glDisable(GL_DEPTH_TEST);
+
+	Matrix44f model_view_projection = Matrix44f::Identity();
+
+	glActiveTexture(GL_TEXTURE0);
+	glBindTexture(GL_TEXTURE_2D, mDepthTexture);
+
+	// render depth texture
+	glUseProgram(mLinearizeDepthProgram.mProgramId);
+	mLinearizeDepthProgram.SetMat44("uModelViewProj", model_view_projection);
+	mLinearizeDepthProgram.SetFloat("uNear", camera.mNear);
+	mLinearizeDepthProgram.SetFloat("uFar", camera.mFar);
+	mLinearizeDepthProgram.SetFloat("uIsOrthographic", camera.mIsOrthographic ? 1.0f : 0.0f);
+	mLinearizeDepthProgram.SetInt("uDepthTexture", 0);
+
+	glEnableVertexAttribArray(0);
+	glBindBuffer(GL_ARRAY_BUFFER, mQuadVertexBuffer);
+	glVertexAttribPointer(
+			0,				// attribute 0
+			3,				// size
+			GL_FLOAT,	// type
+			GL_FALSE,	// normalized?
+			0,				// stride
+			(void*)0	// offset
+			);
+
+	glDrawArrays(GL_TRIANGLES, 0, 6);	// starting from vertex 0; 3 vertices total
+
+	if (mFlags & EnableColor)
+		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mColorTexture, 0);
+	glBindFramebuffer(GL_FRAMEBUFFER, 0);
 }
 
 //

src/modules/RenderUtils.h

@@ -129,6 +129,50 @@ struct Transform {
 	}
 };
 
+struct Camera {
+	Vector3f mEye;
+	Vector3f mPoi;
+	Vector3f mUp;
+
+	float mNear;
+	float mFar;
+	float mFov;
+	bool mIsOrthographic;
+	float mWidth;
+	float mHeight;
+
+	Matrix44f mProjectionMatrix;
+	Matrix44f mViewMatrix;
+
+	Camera() :
+		mEye {5.f, 4.f, 5.f},
+		mPoi {0.f, 2.f, 0.f},
+		mUp  {0.f, 1.f, 0.f},
+		mNear (0.1f),
+		mFar (150.f),
+		mFov (60.f),
+		mIsOrthographic (false),
+		mWidth (-1.f),
+		mHeight (-1.f),
+
+		mProjectionMatrix (
+			1.f, 0.f, 0.f, 0.f,
+			0.f, 1.f, 0.f, 0.f,
+			0.f, 0.f, 1.f, 0.f,
+			0.f, 0.f, 0.f, 1.f),
+		mViewMatrix (
+			1.f, 0.f, 0.f, 0.f,
+			0.f, 1.f, 0.f, 0.f,
+			0.f, 0.f, 1.f, 0.f,
+			0.f, 0.f, 0.f, 1.f)
+		{}
+
+	void UpdateMatrices();
+	void DrawGui();
+};
+
+
+
 struct RenderProgram : AFileModificationListener {
 	std::string mVertexShaderFilename;
 	std::string mFragmentShaderFilename;
@@ -153,6 +197,14 @@ struct RenderProgram : AFileModificationListener {
 	GLuint CompileFragmentShader();
 	GLuint LinkProgram(GLuint vertex_shader, GLuint fragment_shader);
 
+	void SetInt(const char* name, const GLint& val) {
+		GLint location = glGetUniformLocation(mProgramId, name);
+		glUniform1i(location, val);
+	}
+	void SetFloat(const char* name, const float& val) {
+		GLint location = glGetUniformLocation(mProgramId, name);
+		glUniform1f(location, val);
+	}
 	void SetVec3(const char* name, const Vector3f& vec) {
 		GLint location = glGetUniformLocation(mProgramId, name);
 		glUniform3fv(location, 1, vec.data()); 
@@ -179,7 +231,7 @@ struct RenderProgram : AFileModificationListener {
 };
 
 struct RenderSettings;
-
+struct RenderProgram;
 
 struct RenderTarget {
 	int mWidth = 0;
@@ -199,13 +251,19 @@ struct RenderTarget {
 
 	int mFlags = 0;
 
+	RenderProgram mLinearizeDepthProgram;
+	GLuint mQuadVertexArray = -1;
+	GLuint mQuadVertexBuffer = -1;
+
 	RenderTarget() {};
-	RenderTarget(int width, int height, int flags);
 	~RenderTarget();
 
+	void Initialize(int width, int height, int flags);
+	void Bind();
 	void Cleanup();
 	void Resize(int width, int height);
-	void RenderToLinearizedDepth(bool render_to_depth);
+
+	void RenderToLinearizedDepth(const Camera &camera);
 };
 
 struct Texture {